Process of applying a metallic layer to another metal



metal.

Pate-ma ne -.43, {1 926.1 H

meme warren, or nunmaim ennnn'r. '1

raocnss or nrrumo a menus mm'roi-axornna-unrnn Io Drawing.

My invention pertains to a process of applying a 'metall'c layer of desired thickness "upon another metal so'that thecontactmg surfaces of both metals completely, adhere .to each other, without possibilit of-separation. ThelinVention is e'specia adapted-- foraise when-ibis intended to rapp ya layer ifvmetal like nickel or chromium or al oys of the iron or chromium group u men or base'metal likeiron. a A

plishment of the union of the two-distinct metals by use of the-one metal in its molten 1 state while a more common metal retains. its solid form, and while preventing oxidation, so, asto efiect a'lasting union and preserve the quality of the applied layer of Processes-have been known, according to which two-metals were joined-in similar applied while in oxidized by reason of manner, but Y I have serious shortcomings which considerably lowered the (audit of the roduct. cording to sue dc ective met ods, thebase upon'whichthe layer of metal should be its molten state, must be p heated to, the -maximuxn feasible' temature in order that the molte r metal mes welded thereto when it impinges. The necessarily high preheating results in the underlying metal becoming more or less the oxygen in the air and in consequence union of it with the molten metal. If such oiidation occurs, the two metals will not weld over their entire contacting surfaces, but are onl sporadically stuck together and will there ore again separate during use.-

That is the more ikely often to occur when two" metal elements which are so attached later become subjected to an operation like rolling, tension or cutting.

I have moreover discovered that the quality of the fluid-applied metal suffered a reciably during the practice of previous y known methods owing to its exposure to atmospheric oxygen while pouredor deposited dropwise upon the base and thereby 50:.

became more or less oxidized or impregnated with gases of oxygen content. This is es eciallly apt to occur when the molten meta use group, but to that of manganese, cobalt, nickel, also to constituents of the chromium group such as chromium, tungsten, molybn a com};- istinguish- I 11'1 feature of my mvention is" the accomdiscovered that the methods heretofore practiced involved two I al with a reducing-gas stream of the charac- Acter above stated from the time of commence-V frustrates a "reliable does not belong to the iron denum and which have/a high" at":

According y, the successfiilly attained ob -l jects of. my invention have been to prevent oxidation of the underlying metal which it.

is required directing the jetfof reducing gas flames. ainst that portion of the surface of the un erlying metal hase upon which the molten metal is to be poured 'or dropped.

The'gasmay behydrogen, carbon monoxide or in some instances acet hohydrates, and its up vents oxidation, so that? heatin stage can carry the preof the lower metallic layer to a the molten metal is assured.-

has or other carf 142M310!!! quite prev u to preheat as well as to prevent Ib S lPtIOIl of oxygen by the gravitationally applied molten metal. I achieve the desired .cnds by in which its upper surface commences to melt, whereby an absolute fusion ment of its liquefaction gnd'further in en- H veloping-the stream or drops of the molten e w hlthe reducing lot while being deposited upon the base metal. f

My process" of absolutely preventi access of air and ofobtaining the big degree of localized heating of the base ermits me to" realize a product-in which-t e two metallic layers are homogeneouslyalloyed over the entire area of their contactingsurthe 'faces and in which the applied layier. of

metal preserves its high quality, f re qulred, the products ofmy methodmay'be suh ectedto. any additional manufacturing processwithoiit danger of separation of the l certain cases, 01- extwo metal layers. ample when the .form of the work piece-al-f lows, the reducing agenc may .be-simult-aneonsly utilized to pre eat the base or melt-the other metal orto perform both-operations in unison.

1 I claim: 1 The step in a metal layer upon another'metal by pouring molten metal upon another highly heated metal-which consists in effecting the preheat' of the metal constituting the receiving a reducing gas stream over that portion of the surface of said base which is to be covered by the molten metal whereby to preclude oxidation.

the process of depositing ase by continuous application of 2. The process as specified in claim 1, in which the preheating of'the metabbase progresses under the complete protection of the reducing gases until all of its surface which is to be' covered with molten metal just reaches fusion temperature while preventing oxidation by exclusion of air.

3. The process according to claim 1, in which molten metal is enveloped in a stream of reducing gas to accomplish its liquefaction and thereafter likewise enveloped by said reducing gas stream during its application to the base metal.

4:. The process according to claim 1, in which the applied molten metal is enveloped in a stream of reducting gas both during RICHARD JVALTER. 

